Gary Busey stars in the “Entourage” movie — but when the far-out actor showed up on the film set, he didn’t remember he’d ever been in the HBO show.

According to director Doug Ellin, when he instructed Busey in the movie to “do it like he did for TV,” the actor — who played himself in multiple episodes from 2004 to 2007 — asked, “I did the show?”

Ellin added at an AOL Build talk, “I go, ‘Are you [bleeping] with me right now?’ — and he wasn’t. I don’t think he ­remembered it.”

And Busey “used to carry like a ‘Pulp Fiction’ suitcase with him that no one was allowed to go near,” Ellin recalled. “We didn’t know if there was like a bomb in it. He had a security guard walking around with this case.”